if you listen to the tape. gz claims tm has his hand over his mouth and is "BANGING" his head into the pavement while saying he was going to kill him. imo that would result in more that just 3 superficial cuts that did not require stitches, per the medical report i have posted many times - and how could gz be screaming like he said if tm had his hand over his mouth??
That might actually explain why the sounds were more like a high pitched moaning/muffled screaming with a few "help, help me!" sounds interspersed in there.